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/********************* */
/*! \file quant_relevance.cpp
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2017 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Implementation of quantifier relevance
**/
#include "theory/quantifiers/quant_relevance.h"
using namespace std;
using namespace CVC4::kind;
using namespace CVC4::context;
namespace CVC4 {
namespace theory {
namespace quantifiers {
void QuantRelevance::registerQuantifier(Node f)
{
// compute symbols in f
std::vector<Node> syms;
computeSymbols(f[1], syms);
d_syms[f].insert(d_syms[f].begin(), syms.begin(), syms.end());
// set initial relevance
int minRelevance = -1;
for (int i = 0; i < (int)syms.size(); i++)
{
d_syms_quants[syms[i]].push_back(f);
int r = getRelevance(syms[i]);
if (r != -1 && (minRelevance == -1 || r < minRelevance))
{
minRelevance = r;
}
}
if (minRelevance != -1)
{
setRelevance(f, minRelevance + 1);
}
}
/** compute symbols */
void QuantRelevance::computeSymbols(Node n, std::vector<Node>& syms)
{
if (n.getKind() == APPLY_UF)
{
Node op = n.getOperator();
if (std::find(syms.begin(), syms.end(), op) == syms.end())
{
syms.push_back(op);
}
}
if (n.getKind() != FORALL)
{
for (int i = 0; i < (int)n.getNumChildren(); i++)
{
computeSymbols(n[i], syms);
}
}
}
/** set relevance */
void QuantRelevance::setRelevance(Node s, int r)
{
if (d_computeRel)
{
int rOld = getRelevance(s);
if (rOld == -1 || r < rOld)
{
d_relevance[s] = r;
if (s.getKind() == FORALL)
{
for (int i = 0; i < (int)d_syms[s].size(); i++)
{
setRelevance(d_syms[s][i], r);
}
}
else
{
for (int i = 0; i < (int)d_syms_quants[s].size(); i++)
{
setRelevance(d_syms_quants[s][i], r + 1);
}
}
}
}
}
} /* CVC4::theory::quantifiers namespace */
} /* CVC4::theory namespace */
} /* CVC4 namespace */
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